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Share repurchases (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands		1 Months Ended	3 Months Ended		6 Months Ended
	Aug. 01, 2025	Aug. 01, 2025	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024	Sep. 05, 2024
Equity, Class of Treasury Stock [Line Items]
Repurchase of common stock (in shares)			3,067	2,655	6,727	4,774
Treasury Stock, Value, Acquired, Cost Method			$ 446,024	$ 375,831	$ 996,246	$ 615,948
Treasury Stock Acquired, Average Cost Per Share			$ 144.00	$ 140.14	$ 146.69	$ 127.98
Stock Repurchase Program, Authorized Amount							$ 2,000,000
Open Market Purchases
Equity, Class of Treasury Stock [Line Items]
Repurchase of common stock (in shares)			1,921	2,655	5,378	4,774
Treasury Stock, Value, Acquired, Cost Method			$ 275,761	$ 375,831	$ 793,982	$ 615,948
Treasury Stock Acquired, Average Cost Per Share			$ 142.15	$ 140.14	$ 146.25	$ 127.98
Berkshire Repurchases
Equity, Class of Treasury Stock [Line Items]
Repurchase of common stock (in shares)			1,146	0	1,349	0
Treasury Stock, Value, Acquired, Cost Method			$ 170,263	$ 0	$ 202,264	$ 0
Treasury Stock Acquired, Average Cost Per Share			$ 147.11	$ 0	$ 148.45	$ 0
Subsequent Event
Equity, Class of Treasury Stock [Line Items]
Repurchase of common stock (in shares)		2,749
Treasury Stock, Value, Acquired, Cost Method		$ 393,461
Treasury Stock Acquired, Average Cost Per Share		$ 141.68
Stock Repurchase Program, Remaining Authorized Repurchase Amount	$ 557,971	$ 557,971
Subsequent Event | Berkshire
Equity, Class of Treasury Stock [Line Items]
Repurchase of common stock (in shares)	1,636
Treasury Stock, Value, Acquired, Cost Method	$ 230,025
Treasury Stock Acquired, Average Cost Per Share	$ 140.61

X

- Definition

Amount authorized for purchase of share under share repurchase plan. Includes, but is not limited to, repurchase of stock and unit of ownership.

+ References

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Amount remaining authorized for purchase of share under share repurchase plan. Includes, but is not limited to, repurchase of stock and unit of ownership.

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Total cost of shares repurchased divided by the total number of shares repurchased.

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Number of shares that have been repurchased during the period and are being held in treasury.

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Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method.

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